A retro game engine for Python
Free, open source game engine online
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Full featured MUD server with all the trimmings.
online 4X browser game engine
Educational framework for OpenGLES, OpenCL and OpenAL
Java Client + JS/Canvas Server-Side System, with maintained Objects
Demonstrating the features of jMonkeyEngine 3.
Free MMORPG Engine. Develop and host graphical browser-based games.
Gomoku Game: Playing with Computer